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 Post subject: Identification help needed
PostPosted: Tue Nov 26, 2013 11:49 am 
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Morning.
Someone sent me these shots asking for help with identification.
Any thoughts?

Thanks


Image

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 Post subject: Re: Identification help needed
PostPosted: Tue Nov 26, 2013 12:52 pm 
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Looks a bit like some of the more exclusive jaspers ("imperial jasper", etc). I might have guessed serpentine based just on the front shot, though. A quick hardness test would easily eliminate that.

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 Post subject: Re: Identification help needed
PostPosted: Tue Nov 26, 2013 1:04 pm 
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To clarify, take a pocket knife and see if you can scratch the unknown with the tip.

Look at the scratch with some magnification to make sure what you are seeing is either an actual indentation OR a metallic line created by the knife being SOFTER than the specimen.


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 Post subject: Re: Identification help needed
PostPosted: Tue Nov 26, 2013 3:35 pm 
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likely a glass slag

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 Post subject: Re: Identification help needed
PostPosted: Tue Nov 26, 2013 3:47 pm 
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It doesn't really look like slag to me. No obvious conchoidal fracture, no streamy colors, no clarity.

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 Post subject: Re: Identification help needed
PostPosted: Wed Nov 27, 2013 11:26 am 
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I've got some petrified bog wood from Nevada that looks a little bit like that.

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